Mold for the manufacture of concrete tiles



H. J. BRADT. mow ron THE MANUFACTURE OF coucnm mss.

APPLICATION FVILED DEC. 8'. I916- 1,312,827, Patented Aug. 12, 1919.

n INN-WV W HAROLD J. BItADT, OF ROYAL OAK, MICHIGAN.

I MOLD FOR THE MANUFACTURE OF CONCRETE TILES.

Specification of Letters Patent;

' Application filed December 8, 1916. Serial no. 135,753.

To all whom it may concern;

Be it known that I, HARoLD J. BRADT, a citizen of the United States of America, residing at Royal Oak, in the county of Oakland and State of Michigan, have invented certain' new and useful Improvements in Molds for the Manufacture of Concrete Tiles, of which the following is a specification, reference being had therein to the accompanying drawings. p

This invention relates to the manufacture of tile from concrete and other cementitious or plastic material, and the primary object of my invention is to, provide a novelmold in which hollow tiles or other moldings may be expeditiously and economically produced, the mold including novel cores, core Walls and mold walls, all of which can be easily and quickly assembled to permit of concrete or other cementitious material bein poured to form hollow tiles possessing t e same stlrength and rigidity. as baked orv kiln burnt ti es.

Another object of my invention is to provide a mold that permits of moldings therein being easily and quickly cured or seasoned, and the parts of the mold are constructed with a view of being interchangeable, inexpensive to manufacture, and highly efficient for producing hollow concrete tiles.

My invention will be hereinafter specifically described and then claimed, and reference will now be had to the drawing wherem Figure 1 is a perspective view of a mold, partly broken away and partly in section;

Fig. 2 is a longitudinal sectional view of the same;

Fig. 3 is a perspective view of portions of the core and mold walls;

Fig. 4 is a perspective view of a core, and

Fig. 5 is a perspective view of a concrete tile such as may be produced in the mold.

In the drawing, the reference numerals 1 denote mold members, and these members may represent cleats on a car body which will permit of the mold being easily moved from one place to another, for instance, from a pouring station to a curing or seasoning room. On the mold members 1 are placed bottom plates 2, mold partitions 3, mold walls 1, and side mold walls 5. The

mold partitions 3 have the lower edges thereof between the bottom plates 2 and said mold partitions, at intervals, have vertically alining slots 6 and notches 7 These slots and notches provide clearance for the ends of core walls8 placed between the mold partitions 3 and the mold end walls 4: to provide rectangular compartments in the mold structure formed by the walls 4. and 5. Each core wall has a set of rectangular-openings 9 and one end of the wall terminates in a main tongue'lO and an auxiliary tongue 11. The opposite end of the wall has a main recess 12 and an auxiliary recess 13,-and when the core walls 8 are placed in position, the main tongues 10 extend through the slots 6 of the Patented Aug. 12,1919.

mold partitions and into the main recesses 12 of the core walls on the opposite sides of the mold partition, while the auxiliary.

tongues 11 abut the mold partitions and retain said partitions in the auxiliary recesses 1310f the core walls. The juncture of the core walls is effected at opposite sides of the mold partition, as best shown in Fig. 2, and it is practically impossible for the core-walls to become accidentally displaced relative to the'mold partition. On account of the core walls and the mold partitions being made of relatively thin material, it is essential that the juncture of the core walls be effected other than directly at the mold partition.

The mold side walls 5 are provided with sets of rectangular openings 14 alining with theopenings 9 of the core walls 8 and the walls 4 and 5 are adapted to be held assembled on the mold members 1 by suitably placed stakes 15 and wedges 16, it being preferable to use stakes at the ends of the wall partitions'and wedges against the mold end walls 4, so that with the core walls 8 in position, the mold structure may be firmly braced and held to provide a plurality of rectangular compartments into which concrete can be easily poured.

Mounted in the openings 9 of the core walls 8 and the openings 14 of the mold side walls 5 are hollow collapsible cores generally designated 17. These cores are rectangular in cross section and each core is composed of a plurality of tapering members 18 preferably four in number with each member angular in cross section and tapering from one end thereof to the opposite end. Two of the members 18 are arranged the reverse of the other two members with the tapering edges of the members contacting so as to form a hollow rectangular core. Each member has a suitable handle 19 and when the members are assembled in the openings 9 and 14, there are two handles at each end of the core, so that two of the members of the core may be conveniently gripped at one of the side walls 5 and pulled outwardly to collapse the core, at which time two of the core members can be conveniently removed at one of the mold side walls and the other two members removed at the opposite side mold wall.

Assuming that the collapsible cores are in position, concrete or other cementitious material can be readily poured into the mold compartments to completely fill the compartments, as shown at the left hand side of Fig. 1. After the concrete has become indurate, the cores 17 can be removed and the mold knocked down, thus leaving moldings on the bottom plates 2 with rectangular parallel longitudinal openings therethrough. These moldings provide concrete tiles, one of which is shown in Fig. 5, and designated 20, the tile having the usual openings 21.

It is thought that the utility of the mold will be apparent without further description, and while in the drawing there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims.

What I claim is 1. A mold for making concrete tiles comprising mold walls, partitions, and core walls, said core walls having the ends thereof intermeshed with said mold partitions, all of said walls cooperating in providing rectangular compartments and two of the walls of each compartment having rectangular openings, and collapsible cores mounted in the openings of said walls with said cores extending through a plurality of compartments.

2. A mold for making concrete tiles comprising bottom plates, end mold walls, side mold walls, mold partitions between said side mold walls, core walls having intermeshing ends with said mold partitions, said core walls and said side mold walls having alining openings, rectangular hollow collapsible cores extending through the openings of said core walls and'said side mold walls, and spaced from said bottom plates and said mold partitions.

In testimony whereof I afiiX my signature in the presence of two witnesses.

HAROLD J. BRADT.

WVitnesses KARL H. BUTLER, ANNA M. DORR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, I). G. 

